Найти корень уровнения 〖(1/3)〗^(20-x)=9
(1/3)⁽²⁰⁻ˣ⁾ = 9,
(1/3)⁽²⁰⁻ˣ⁾ = 3²,
(1/3)⁽²⁰⁻ˣ⁾ = (1/3)⁻²,
20 - х = -2,
х = 20 + 2,
х = 22